A fabricated type of pseudohistory that is typically created and shared with others in some kind of public forum—often seen as a form of shit posting somewhere on the internet. The creation of the pseudo history shitpost—or shistory—is typically intended for humor, internet trolling, misleading a group of people, or to shed light on a particular subject (or a combination of these intents).

Mark: "Hey Ashley! How great was that shistory lesson Ms. Howard gave us about the battalion in the Civil War that rode grizzly bears instead of horses?!?"
Ashley: "It was hilarious! I had no idea where she was going with it either, but boy did she fool us!"